Hi Matt, Thanks for your interest in using abnf. I admit that the details of parsing are hidden away in the documentation for lexgen. I have updated the example to include a definition for fws and create and import the appropriate input type classes (more or less equivalent to importing abnf-charlist). Abnf is intended to be very flexible with regards to input formats, so it is in a sense necessary to define your own custom parser specialized for your needs. However, for simple testing the lexgen `lex' procedure should suffice, so I have extended the abnf example to use it for parsing. lex takes an input string and converts it to a char list input stream representation; however many other input representations are possible. I will copy the documentation on input formats from lexgen and include it in the abnf page. Let me know if I can help with anything else.
-Ivan On Thu, Mar 26, 2015 at 7:53 PM, Matt Gushee <[email protected]> wrote: > Hello-- > > I'm attempting to learn how to use the abnf egg, but I'm having some > difficulties. > > First of all, I think the example needs to be updated. It uses the 'lit' > matcher, which requires 'abnf-charlist' to be imported; also, the 'fws' and > 'cfws' symbols are not defined. It's not hard to define them if you know the > grammar, but given that this is the only example for the egg, it would be > nice if it were a complete working example. > > However, the greater challenge for me is understanding how to use the > parsing rules once you have defined them. Since there is apparently no > 'parse' function, I have no idea what to do. Is it necessary to define one's > own parser? If so, what arguments does it need to take, and what does it > return? > > Thanks for any info. > > -- > Matt Gushee > > _______________________________________________ > Chicken-users mailing list > [email protected] > https://lists.nongnu.org/mailman/listinfo/chicken-users > _______________________________________________ Chicken-users mailing list [email protected] https://lists.nongnu.org/mailman/listinfo/chicken-users
